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Issues WIth OCing GPU & CPU At The Same Time

post #1 of 19
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To start off I was having issues playing with Skyrim at Ultra settings my rig. After reading advice from the forums and downloading EVGA Precision X, I was able to successfully OCed my 780 FTW with a noticeable 2-4 FPS increase in Skyrim. Used the Heaven Benchmark software and my FPS was around 113-114.8 after multiple tests. Here are my OCed settings:

Power Target: 107%
Temp Targer: 85%
GPU Offset: +104
Memory Offset: +125
Fan Speed: 100% at 70 C

The GPU likes to stay below 70 C while in use for games.

With that working as intended, I moved along to OCing my 15-4670k. As a novice to OCing, I started at a modest 4.0 Ghz and increased the voltage to 1.2 V as recommended in the Haswell Guide. After OCing the CPU, I run the aida64 stress test for 9 hours with no BSOD. Here are my results:


stabilitytest.png 73k .png file

With both the GPU & CPU OCed, I decided to start running the Heaven Benchmark and monitored the temperatures. At first I was shocked to find that my FPS was down to 108-109. Then I decided to run Skyrim to find that the FPS reverted back to the same levels before I started OCing. Using Real Temp my CPU maxes at the mid 60s while Skyrim is running.

My question is what is not working properly with both of them OCed and can I fix this issue? Or is it a faulty component?

Thanks.
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post #2 of 19
Might be worth running prime95 to stable test that cpu overclock.

From what I gather from sins haswell overclocking guide, you can leave uncore overclocking up to the 4.5ghz mark, so that would just leave cpu vcore, cpu multiplier that need changing.
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post #3 of 19
if you o/c the video card too much it will begin to show signs of instability by dropped frames.

if your cooling is substantial enough try adding a little voltage to the gpu.
if it isnt, back down the mhz by like 20mhz and see if the frame rates go back up.
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post #4 of 19
Thread Starter 
Quote:
Originally Posted by $ilent View Post

Might be worth running prime95 to stable test that cpu overclock.

From what I gather from sins haswell overclocking guide, you can leave uncore overclocking up to the 4.5ghz mark, so that would just leave cpu vcore, cpu multiplier that need changing.

I will run Prime95 tomorrow night since I will need time to test it out on that program. How long would you recommend I run the test?

I do not think I would want to modify the uncore overclocking that high since my CPU Cooler is only modest OCing as a non-water cooling fan. Right now I have it set at 34/40 (.85:1).
Quote:
Originally Posted by fade2green514 View Post

if you o/c the video card too much it will begin to show signs of instability by dropped frames.

if your cooling is substantial enough try adding a little voltage to the gpu.
if it isnt, back down the mhz by like 20mhz and see if the frame rates go back up.

I have checked the Precision X results and the temperatures are below 70 when I tested it on games with both components OCed. I have read that keeping the GPU under 85 should not stress the GPU. Am I missing a key detail that would tell me if the GPU was stressed with both GPU & CPU OCed at the same time?
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post #5 of 19
Your 12 volt rail is also less stable when at full load. So a stress test on CPU and GPU one at a time it may past just fine. But when both CPU and GPU are under load then the 12 volt stability of the PSU will start to show its face.
 
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post #6 of 19
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Quote:
Originally Posted by UNOE View Post

Your 12 volt rail is also less stable when at full load. So a stress test on CPU and GPU one at a time it may past just fine. But when both CPU and GPU are under load then the 12 volt stability of the PSU will start to show its face.

So a full aida64 system stability test with stress to all components be able to test the 12v rail? If it turns out that it is not stable, what would I need to do?
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post #7 of 19
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Before I attempt to do anymore tests, I want to know if the CPU fan is installed in the correct position for OCing purposes:




My BIL was the one who assembled my PC together (due to my very, VERY poor motor skills) so I do not know how to remove it and place it on the other side of the CPU heatsink.
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post #8 of 19
Quote:
Originally Posted by KJZ87 View Post

I will run Prime95 tomorrow night since I will need time to test it out on that program. How long would you recommend I run the test?

I do not think I would want to modify the uncore overclocking that high since my CPU Cooler is only modest OCing as a non-water cooling fan. Right now I have it set at 34/40 (.85:1).
I have checked the Precision X results and the temperatures are below 70 when I tested it on games with both components OCed. I have read that keeping the GPU under 85 should not stress the GPU. Am I missing a key detail that would tell me if the GPU was stressed with both GPU & CPU OCed at the same time?

Run prime95 for 12 hours ideally.
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post #9 of 19
70C is fine for your gpu, but that doesnt mean its stable. you're confusing stability for temperature. you could put a water cooler on the gpu, and it could be 60C, but still unable to handle higher clocks. the only way to get the lost fps and stability back is to add voltage. unless you want to lower the clockspeed again.
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post #10 of 19
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I have started the prime95 test and the temps for the cpu have already reach 87 at its highest. Not good...
Quote:
Originally Posted by fade2green514 View Post

70C is fine for your gpu, but that doesnt mean its stable. you're confusing stability for temperature. you could put a water cooler on the gpu, and it could be 60C, but still unable to handle higher clocks. the only way to get the lost fps and stability back is to add voltage. unless you want to lower the clockspeed again.

Ok, I see, but if it was unstable then why was there a FPS increase earlier with the OC GPU before I OCed the CPU?
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